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1// SPDX-License-Identifier: GPL-2.0+2/*3 * vsp1_uds.c -- R-Car VSP1 Up and Down Scaler4 *5 * Copyright (C) 2013-2014 Renesas Electronics Corporation6 *7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)8 */9 10#include <linux/device.h>11#include <linux/gfp.h>12 13#include <media/v4l2-subdev.h>14 15#include "vsp1.h"16#include "vsp1_dl.h"17#include "vsp1_pipe.h"18#include "vsp1_uds.h"19 20#define UDS_MIN_SIZE 4U21#define UDS_MAX_SIZE 8190U22 23#define UDS_MIN_FACTOR 0x010024#define UDS_MAX_FACTOR 0xffff25 26/* -----------------------------------------------------------------------------27 * Device Access28 */29 30static inline void vsp1_uds_write(struct vsp1_uds *uds,31 struct vsp1_dl_body *dlb, u32 reg, u32 data)32{33 vsp1_dl_body_write(dlb, reg + uds->entity.index * VI6_UDS_OFFSET, data);34}35 36/* -----------------------------------------------------------------------------37 * Scaling Computation38 */39 40void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_body *dlb,41 unsigned int alpha)42{43 struct vsp1_uds *uds = to_uds(&entity->subdev);44 45 vsp1_uds_write(uds, dlb, VI6_UDS_ALPVAL,46 alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);47}48 49/*50 * uds_output_size - Return the output size for an input size and scaling ratio51 * @input: input size in pixels52 * @ratio: scaling ratio in U4.12 fixed-point format53 */54static unsigned int uds_output_size(unsigned int input, unsigned int ratio)55{56 if (ratio > 4096) {57 /* Down-scaling */58 unsigned int mp;59 60 mp = ratio / 4096;61 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);62 63 return (input - 1) / mp * mp * 4096 / ratio + 1;64 } else {65 /* Up-scaling */66 return (input - 1) * 4096 / ratio + 1;67 }68}69 70/*71 * uds_output_limits - Return the min and max output sizes for an input size72 * @input: input size in pixels73 * @minimum: minimum output size (returned)74 * @maximum: maximum output size (returned)75 */76static void uds_output_limits(unsigned int input,77 unsigned int *minimum, unsigned int *maximum)78{79 *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);80 *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);81}82 83/*84 * uds_passband_width - Return the passband filter width for a scaling ratio85 * @ratio: scaling ratio in U4.12 fixed-point format86 */87static unsigned int uds_passband_width(unsigned int ratio)88{89 if (ratio >= 4096) {90 /* Down-scaling */91 unsigned int mp;92 93 mp = ratio / 4096;94 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);95 96 return 64 * 4096 * mp / ratio;97 } else {98 /* Up-scaling */99 return 64;100 }101}102 103static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)104{105 /* TODO: This is an approximation that will need to be refined. */106 return (input - 1) * 4096 / (output - 1);107}108 109/* -----------------------------------------------------------------------------110 * V4L2 Subdevice Pad Operations111 */112 113static int uds_enum_mbus_code(struct v4l2_subdev *subdev,114 struct v4l2_subdev_state *sd_state,115 struct v4l2_subdev_mbus_code_enum *code)116{117 static const unsigned int codes[] = {118 MEDIA_BUS_FMT_ARGB8888_1X32,119 MEDIA_BUS_FMT_AYUV8_1X32,120 };121 122 return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, codes,123 ARRAY_SIZE(codes));124}125 126static int uds_enum_frame_size(struct v4l2_subdev *subdev,127 struct v4l2_subdev_state *sd_state,128 struct v4l2_subdev_frame_size_enum *fse)129{130 struct vsp1_uds *uds = to_uds(subdev);131 struct v4l2_subdev_state *state;132 struct v4l2_mbus_framefmt *format;133 int ret = 0;134 135 state = vsp1_entity_get_state(&uds->entity, sd_state, fse->which);136 if (!state)137 return -EINVAL;138 139 format = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);140 141 mutex_lock(&uds->entity.lock);142 143 if (fse->index || fse->code != format->code) {144 ret = -EINVAL;145 goto done;146 }147 148 if (fse->pad == UDS_PAD_SINK) {149 fse->min_width = UDS_MIN_SIZE;150 fse->max_width = UDS_MAX_SIZE;151 fse->min_height = UDS_MIN_SIZE;152 fse->max_height = UDS_MAX_SIZE;153 } else {154 uds_output_limits(format->width, &fse->min_width,155 &fse->max_width);156 uds_output_limits(format->height, &fse->min_height,157 &fse->max_height);158 }159 160done:161 mutex_unlock(&uds->entity.lock);162 return ret;163}164 165static void uds_try_format(struct vsp1_uds *uds,166 struct v4l2_subdev_state *sd_state,167 unsigned int pad, struct v4l2_mbus_framefmt *fmt)168{169 struct v4l2_mbus_framefmt *format;170 unsigned int minimum;171 unsigned int maximum;172 173 switch (pad) {174 case UDS_PAD_SINK:175 /* Default to YUV if the requested format is not supported. */176 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&177 fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)178 fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;179 180 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);181 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);182 break;183 184 case UDS_PAD_SOURCE:185 /* The UDS scales but can't perform format conversion. */186 format = v4l2_subdev_state_get_format(sd_state, UDS_PAD_SINK);187 fmt->code = format->code;188 189 uds_output_limits(format->width, &minimum, &maximum);190 fmt->width = clamp(fmt->width, minimum, maximum);191 uds_output_limits(format->height, &minimum, &maximum);192 fmt->height = clamp(fmt->height, minimum, maximum);193 break;194 }195 196 fmt->field = V4L2_FIELD_NONE;197 fmt->colorspace = V4L2_COLORSPACE_SRGB;198}199 200static int uds_set_format(struct v4l2_subdev *subdev,201 struct v4l2_subdev_state *sd_state,202 struct v4l2_subdev_format *fmt)203{204 struct vsp1_uds *uds = to_uds(subdev);205 struct v4l2_subdev_state *state;206 struct v4l2_mbus_framefmt *format;207 int ret = 0;208 209 mutex_lock(&uds->entity.lock);210 211 state = vsp1_entity_get_state(&uds->entity, sd_state, fmt->which);212 if (!state) {213 ret = -EINVAL;214 goto done;215 }216 217 uds_try_format(uds, state, fmt->pad, &fmt->format);218 219 format = v4l2_subdev_state_get_format(state, fmt->pad);220 *format = fmt->format;221 222 if (fmt->pad == UDS_PAD_SINK) {223 /* Propagate the format to the source pad. */224 format = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE);225 *format = fmt->format;226 227 uds_try_format(uds, state, UDS_PAD_SOURCE, format);228 }229 230done:231 mutex_unlock(&uds->entity.lock);232 return ret;233}234 235/* -----------------------------------------------------------------------------236 * V4L2 Subdevice Operations237 */238 239static const struct v4l2_subdev_pad_ops uds_pad_ops = {240 .enum_mbus_code = uds_enum_mbus_code,241 .enum_frame_size = uds_enum_frame_size,242 .get_fmt = vsp1_subdev_get_pad_format,243 .set_fmt = uds_set_format,244};245 246static const struct v4l2_subdev_ops uds_ops = {247 .pad = &uds_pad_ops,248};249 250/* -----------------------------------------------------------------------------251 * VSP1 Entity Operations252 */253 254static void uds_configure_stream(struct vsp1_entity *entity,255 struct v4l2_subdev_state *state,256 struct vsp1_pipeline *pipe,257 struct vsp1_dl_list *dl,258 struct vsp1_dl_body *dlb)259{260 struct vsp1_uds *uds = to_uds(&entity->subdev);261 const struct v4l2_mbus_framefmt *output;262 const struct v4l2_mbus_framefmt *input;263 unsigned int hscale;264 unsigned int vscale;265 bool multitap;266 267 input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);268 output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE);269 270 hscale = uds_compute_ratio(input->width, output->width);271 vscale = uds_compute_ratio(input->height, output->height);272 273 dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);274 275 /*276 * Multi-tap scaling can't be enabled along with alpha scaling when277 * scaling down with a factor lower than or equal to 1/2 in either278 * direction.279 */280 if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))281 multitap = false;282 else283 multitap = true;284 285 vsp1_uds_write(uds, dlb, VI6_UDS_CTRL,286 (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |287 (multitap ? VI6_UDS_CTRL_BC : 0));288 289 vsp1_uds_write(uds, dlb, VI6_UDS_PASS_BWIDTH,290 (uds_passband_width(hscale)291 << VI6_UDS_PASS_BWIDTH_H_SHIFT) |292 (uds_passband_width(vscale)293 << VI6_UDS_PASS_BWIDTH_V_SHIFT));294 295 /* Set the scaling ratios. */296 vsp1_uds_write(uds, dlb, VI6_UDS_SCALE,297 (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |298 (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));299}300 301static void uds_configure_partition(struct vsp1_entity *entity,302 struct vsp1_pipeline *pipe,303 const struct vsp1_partition *partition,304 struct vsp1_dl_list *dl,305 struct vsp1_dl_body *dlb)306{307 struct vsp1_uds *uds = to_uds(&entity->subdev);308 309 /* Input size clipping. */310 vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN |311 (0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) |312 (partition->uds_sink.width313 << VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT));314 315 /* Output size clipping. */316 vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE,317 (partition->uds_source.width318 << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |319 (partition->uds_source.height320 << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));321}322 323static unsigned int uds_max_width(struct vsp1_entity *entity,324 struct v4l2_subdev_state *state,325 struct vsp1_pipeline *pipe)326{327 const struct v4l2_mbus_framefmt *output;328 const struct v4l2_mbus_framefmt *input;329 unsigned int hscale;330 331 input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);332 output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE);333 hscale = output->width / input->width;334 335 /*336 * The maximum width of the UDS is 304 pixels. These are input pixels337 * in the event of up-scaling, and output pixels in the event of338 * downscaling.339 *340 * To support overlapping partition windows we clamp at units of 256 and341 * the remaining pixels are reserved.342 */343 if (hscale <= 2)344 return 256;345 else if (hscale <= 4)346 return 512;347 else if (hscale <= 8)348 return 1024;349 else350 return 2048;351}352 353/* -----------------------------------------------------------------------------354 * Partition Algorithm Support355 */356 357static void uds_partition(struct vsp1_entity *entity,358 struct v4l2_subdev_state *state,359 struct vsp1_pipeline *pipe,360 struct vsp1_partition *partition,361 unsigned int partition_idx,362 struct v4l2_rect *window)363{364 const struct v4l2_mbus_framefmt *output;365 const struct v4l2_mbus_framefmt *input;366 367 input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK);368 output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE);369 370 partition->uds_sink.width = window->width * input->width371 / output->width;372 partition->uds_sink.left = window->left * input->width373 / output->width;374 partition->uds_sink.height = input->height;375 partition->uds_sink.top = 0;376 377 partition->uds_source = *window;378 379 *window = partition->uds_sink;380}381 382static const struct vsp1_entity_operations uds_entity_ops = {383 .configure_stream = uds_configure_stream,384 .configure_partition = uds_configure_partition,385 .max_width = uds_max_width,386 .partition = uds_partition,387};388 389/* -----------------------------------------------------------------------------390 * Initialization and Cleanup391 */392 393struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)394{395 struct vsp1_uds *uds;396 char name[6];397 int ret;398 399 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);400 if (uds == NULL)401 return ERR_PTR(-ENOMEM);402 403 uds->entity.ops = &uds_entity_ops;404 uds->entity.type = VSP1_ENTITY_UDS;405 uds->entity.index = index;406 407 sprintf(name, "uds.%u", index);408 ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,409 MEDIA_ENT_F_PROC_VIDEO_SCALER);410 if (ret < 0)411 return ERR_PTR(ret);412 413 return uds;414}415